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auto-spread
- Add 'f·Power' checkbox: weights spectrum by f before peak detection (f·FFT_Power(f))
to accentuate high-frequency peaks; re-runs extraction on toggle
- Deselect partial after Extract Partials run
- Fix right panel not refreshing after Auto Spread All: re-call editor.onPartialSelect
handoff(Claude): mq_editor UX polish
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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- Map 'E' key to Extract Partials
- Move extractBtn inline style to CSS rule #extractBtn
- Hoist autoSpreadAllBtn DOM ref to top with other refs
- Drop unused PADY local var in _renderAmpEditor
- Remove redundant comment before extractBtn listener
- README: add E/Esc keys, add editor.js to architecture, mark Phase 3 done
handoff(Gemini): mq_editor UX polish + doc consolidated
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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- Document UI layout (right panel, mini-spectrum color coding)
- Add keyboard shortcuts table
- Document viewer.js coordinate API
- Update algorithm section (backward expansion pass)
- Refresh implementation status checklist
handoff(Claude): docs updated
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- tools/mq_editor/test_fft.html: browser test for fft.js (12 tests:
DC impulse, single tone, STFT magnitude, pairs, triplets)
- tools/gen_sine_440.py: generate 1s 440Hz WAV at 32kHz for manual testing
handoff(Gemini): FFT isolation tests added, all passing in browser.
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Phase 2 - JS Synthesizer:
- Created mq_synth.js with replica oscillator bank
- Bezier curve evaluation (cubic De Casteljau algorithm)
- Replica synthesis: frequency spread, amplitude decay, phase jitter
- PCM buffer generation from extracted MQ partials
- Normalization to prevent clipping
- Key '1' plays synthesized audio, key '2' plays original
- Playback comparison with animated playhead
STFT Cache Optimization:
- Created STFTCache class in fft.js for pre-computed windowed FFT frames
- Clean interface: getFFT(t), getMagnitudeDB(t, freq), setHopSize()
- Pre-computes all frames on WAV load (eliminates redundant FFT calls)
- Dynamic cache update when hop size changes
- Shared across spectrogram, tooltip, and mini-spectrum viewer
- Significant performance improvement
Mini-Spectrum Viewer:
- Bottom-right overlay (200x100) matching spectral_editor style
- Real-time FFT display at playhead or mouse position
- 100-bar visualization with cyan-to-yellow gradient
- Updates during playback or mouse hover
Files:
- tools/mq_editor/mq_synth.js (new)
- tools/mq_editor/fft.js (STFTCache class added)
- tools/mq_editor/index.html (synthesis playback, cache integration)
- tools/mq_editor/viewer.js (cache-based rendering, spectrum viewer)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Phase 1 deliverables complete:
- MQ extraction with improved tracking
- Spectrogram visualization with zoom/scroll
- Original WAV playback with playhead
- Ready for Phase 2 (JS synthesizer)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Implement McAulay-Quatieri sinusoidal analysis tool for audio compression.
New files:
- doc/SPECTRAL_BRUSH_2.md: Complete design doc (MQ algorithm, data format, synthesis, roadmap)
- tools/mq_editor/index.html: Web UI (file loader, params, canvas)
- tools/mq_editor/fft.js: Radix-2 Cooley-Tukey FFT (from spectral_editor)
- tools/mq_editor/mq_extract.js: MQ algorithm (peak detection, tracking, bezier fitting)
- tools/mq_editor/viewer.js: Visualization (spectrogram, partials, zoom, axes)
- tools/mq_editor/README.md: Usage and implementation status
Features:
- Load WAV → extract sinusoidal partials → fit cubic bezier curves
- Time-frequency spectrogram with hot colormap (0-16 kHz)
- Horizontal zoom (mousewheel) around mouse position
- Axis ticks with labels (time: seconds, freq: Hz/kHz)
- Mouse tooltip showing time/frequency coordinates
- Real-time adjustable MQ parameters (FFT size, hop, threshold)
Algorithm:
- STFT with Hann windows (2048 FFT, 512 hop)
- Peak detection with parabolic interpolation
- Birth/death/continuation tracking (50 Hz tolerance)
- Cubic bezier fitting (4 control points per trajectory)
Next: Phase 2 (JS synthesizer for audio preview)
handoff(Claude): MQ editor Phase 1 complete. Ready for synthesis implementation.
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